The time period of a simple pendulum on the surface of the earth is $T$. If the pendulum is taken to a height equal to half of the radius of the earth, then its time period is

• A

  $\frac{\mathrm{T}}{2}$
• Correct answer
  B

  $\frac{3 \mathrm{~T}}{2}$
• C

  2 T
• D

  3 T

Hence, the correct answer is option: 'B'.